It's usually just TIED UP -- it means you're busy.
To tie the knot means to get married. The image is of two people tied together.
A drawn match is a tie. "Draw" is just another word for a tied score, so it's not an idiom. You just have to define the two words.
It means to go out into the world and experience life on your own without being tied to your mother's apron strings.
This could be one of several phrases. "Tied the knot" means that you got married. The image is to be tied together. If your stomach is "tied in a knot," it is cramping and painful. If a rope is tied in a knot, it has a place where the ends of the rope cross each other and pull tight."Tied the knot" means to get married. For example, "Mary and Ted tied the knot yesterday" means that Ted and Mary got married.
It's not really an idiom. It means "what are you thinking about."
It is not an idiom, it means your nose is itching.
RFP is not an idiom. It's an abbreviation.
Very angry and upset. The image is being so agitated that only by being physically restrained, as if in a straitjacket, would a person be prevented from doing something rash and regrettable.
"Sieve" is not an idiom. See the related link.
It's not an idiom. It means the tip of your nostril.
idiom means expression like a page in a book